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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric sounding body used for generating operation confirmation sounds and alarm
sounds of home appliances and the like.
2. Description of the Related Art A conventional piezoelectric speaker will be described below.
FIG. 2 is a cross-sectional view of a conventional piezoelectric speaker.
In FIG. 2, 1 is a case, 2 is a piezoelectric diaphragm, 5 is an adhesive, and 6 is a terminal. The
case 1 includes a support 7 and an acoustic resonance space 8. The piezoelectric diaphragm 2
includes a piezoelectric element 3 and a metal substrate 4. The piezoelectric diaphragm 2 is
supported and fixed to the support 7 by an adhesive 5.
However, in the above-described conventional configuration, since the metal substrate 4 is flat,
when the piezoelectric diaphragm 2 is bonded to the support portion 7, the positioning of the
piezoelectric diaphragm 2 is difficult, and the case is The piezoelectric diaphragm 2 may be in
contact with the inner surface of the piezoelectric vibrator 2. This may suppress the flexural
vibration of the piezoelectric diaphragm 2 and cause characteristic deterioration such as a
decrease in sound pressure level or instability of oscillation.
The present invention solves the above-mentioned conventional problems, and an object thereof
is to prevent characteristic deterioration.
[Means for Solving the Problems] In order to achieve this object, the piezoelectric speaker
according to the present invention has a metal substrate provided with a projection projecting
close to the support side, thereby achieving the desired object. It is
According to the first aspect of the present invention, there is provided a case having a support
for supporting a piezoelectric diaphragm and an acoustic resonance space therein, and an
adhesive on the support of the case. A piezoelectric diaphragm supported and fixed, and a
plurality of terminals electrically connected to the piezoelectric diaphragm; the metal substrate
which is a constituent member of the piezoelectric diaphragm is in proximity to the support
portion side; A protruding projection is provided, whereby the positioning is made reliable and a
shift in bonding can be prevented.
FIG. 1 is a cross-sectional view of an embodiment of the present invention.
The piezoelectric sounding body of the embodiment shown in FIG. 1 basically has the same
configuration as that of the conventional piezoelectric sounding body shown in FIG. Simplify
According to the present embodiment, when the piezoelectric diaphragm 2 is bonded to the
support 7, the positioning is performed such that the protrusion 9 protruding toward the support
7 toward the metal substrate 4 adheres to the support 7. Be sure to prevent the lateral
displacement of the piezoelectric diaphragm 2.
As a result, the piezoelectric diaphragm 2 does not come in contact with the inner side surface of
the case 1, and it is possible to prevent the reduction of the sound pressure level and the
instability of the oscillation, and to obtain a highly reliable piezoelectric speaker.
In addition, the projections 9 formed on the metal substrate 4 can be properly positioned if it is
in three or more places so as to be in contact with at least one side along the inner peripheral
surface or the outer peripheral surface of the support 7 Not only does the vibration of the
piezoelectric diaphragm 2 not be disturbed, but by forming the projections 9, a stagnant portion
of the adhesive for bonding the piezoelectric element 3 and the metal substrate 4 is formed on
the opposite side, and the bonding strength of both is improved. Can also contribute.
In one embodiment, the protrusions 9 are formed at the portions of the metal substrate 4 to be
bonded to the support portion 7, but recesses having the same shape as the end surface of the
support portion 7 are formed at the portions to be bonded to the support portion 7 of the metal
substrate 4. Even the same effect is obtained.
As described above, according to the present invention, it is possible to provide a piezoelectric
sounding body in which the positioning of the piezoelectric diaphragm is assured and the
characteristic deterioration is prevented.
Brief description of the drawings
1 is a cross-sectional view of a piezoelectric speaker according to an embodiment of the present
Fig. 2 Cross section of the conventional piezoelectric speaker
Explanation of sign
1 case 2 piezoelectric diaphragm 3 piezoelectric element 4 metal substrate 5 adhesive 6 terminal
7 support portion 8 acoustic resonance space 9 protrusion
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description, jph09218684
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